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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3. <br /> <br />Appropriate access to be provided for each hydraulic component in <br /> <br />accordance with maintenance needs. <br /> <br />The Corps of Engineers and Drs. Simons and Li have recommended that the <br /> <br />hydraul ic analysis of Boulder Creek consider 30% blockage at all <br /> <br />structures. <br /> <br />4. <br /> <br />Identify potential areas for debris removal during the flood event. <br /> <br />DIKES <br />1. Dikes to be evaluated for overtopping potential to insure against <br /> <br />failure from debris blockage downstream or larger floods. <br /> <br />The fundamental design criteria of FEMA is that the project be accom- <br /> <br />plished without increasing the base flood elevations greater than one <br /> <br />foot at any point, particularly upstream and downstream of the project. <br /> <br />Other criteria advocated by FEMA include the following: <br /> <br />2. <br /> <br />Normal freeboard on dikes to be energy grade line plus 1.0 feet, or <br /> <br />2 feet minimum, for QIQO. <br /> <br />I. <br /> <br />The channel should be protected against erosion because of anti- <br /> <br />cipated high velocities. <br />All levees and berms are to be designed consistent with current <br />standards of FEMA levee policy. <br />The project should be designed to address the impacts of sediment <br /> <br />and debris. <br /> <br />2. <br /> <br />DEBRIS AND SEDIMENT <br /> <br />1. Debris evaluation to be based on upstream conditions at present and <br /> <br />estimated conditions for year 2000. <br /> <br />3. <br /> <br />2. <br /> <br />Sediment (suspended and bedload) problems to be evaluated on basis <br /> <br /> <br />of erosion potential for QI00 upstream conditions, and recommendations <br /> <br /> <br />of Colorado Geological Survey. <br /> <br />Drs. Simons and Li have recommended that four feet of freeboard be <br /> <br />provided at all bridges to minimize potential problems associated with <br /> <br />debris. <br /> <br />Figures 1 through v-4 attached, graphically illustrate some of the <br />hydraulic criteria relationships. <br /> <br />39 <br />